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Most paleontologists now agree that an asteroid did hit the Earth at approximately the end of the Cretaceous, but there is an ongoing dispute whether the impact was the sole cause of the extinctions. There is evidence that there was an interval of about 7012946728000000000â 300 ka from the impact to the mass extinction.
The longest period of the Mesozoic Era, it was also during the Cretaceous that the earth began to assume something resembling its modern form, though life (of course) was dominated not by mammals but by terrestrial, marine and avian reptiles.Geography and climate.t the end of the Cretaceous period, 65 million years ago, a meteor impact on the Yucatan Peninsula raised huge clouds of dust, blotting out the sun and causing most of this vegetation to die out.